c# - 出现拒绝访问错误时停止响应写入文件

Question

我有以下代码

try
{        
    GetFileAndDisplay() // Gets the file from the server and writes the file in a Response stream
}
catch (UnauthorizedAccessException ex)
{
    Page.ClientScript.RegisterStartupScript(this.GetType(), "Msg", "<script type='text/javascript'>alert('Error')</script>");
    Response.Clear();                
    Response.ContentType = "";               
    Response.End();                
}

该文件仍会为客户端下载，尽管文件已损坏，但有办法阻止文件下载。

Answer 1

try
{        
    GetFileAndDisplay() // Gets the file from the server and writes the file in a Response stream
}
catch (UnauthorizedAccessException ex)
{
    Page.ClientScript.RegisterStartupScript(this.GetType(), "Msg", "<script type='text/javascript'>alert('Error')</script>");
    Response.Clear();                
    Response.Redirect("path/to/some/page/that/tells/the/user/something/is/wrong")
}

Answer 2

当您捕获 UnauthorizedAccessException 时，为什么不抛出带有相关 HTTP 状态代码（即 401）的 HttpException -

throw new HttpException(401, ex.Message);